Fifo order should be preserved for messages on associated interfaces.

mojo/public/js/connector.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 define("mojo/public/js/connector", [
   "mojo/public/js/buffer",
   "mojo/public/js/codec",
   "mojo/public/js/core",
   "mojo/public/js/support",
 ], function(buffer, codec, core, support) {
 
   function Connector(handle) {
     if (!core.isHandle(handle))
       throw new Error("Connector: not a handle " + handle);
     this.handle_ = handle;
     this.dropWrites_ = false;
     this.error_ = false;
     this.incomingReceiver_ = null;
     this.readWatcher_ = null;
     this.errorHandler_ = null;
+    this.paused_ = false;
 
     if (handle) {
       this.readWatcher_ = support.watch(handle,
                                         core.HANDLE_SIGNAL_READABLE,
                                         this.readMore_.bind(this));
     }
   }
 
   Connector.prototype.close = function() {
     if (this.readWatcher_) {
       support.cancelWatch(this.readWatcher_);
       this.readWatcher_ = null;
     }
     if (this.handle_ != null) {
       core.close(this.handle_);
       this.handle_ = null;
     }
   };
 
+  Connector.prototype.pauseIncomingMethodCallProcessing = function() {
+    if (this.paused_) {
+      return;
+    }
+    this.paused_= true;
+
+    if (this.readWatcher_) {
+      support.cancelWatch(this.readWatcher_);
+      this.readWatcher_ = null;
+    }
+  };
+
+  Connector.prototype.resumeIncomingMethodCallProcessing = function() {
+    if (!this.paused_) {
+      return;
+    }
+    this.paused_= false;
+
+    if (this.handle_) {
+      this.readWatcher_ = support.watch(this.handle_,
+                                        core.HANDLE_SIGNAL_READABLE,
+                                        this.readMore_.bind(this));
+    }
+  };
+
   Connector.prototype.accept = function(message) {
     if (this.error_)
       return false;
 
     if (this.dropWrites_)
       return true;
 
     var result = core.writeMessage(this.handle_,
                                    new Uint8Array(message.buffer.arrayBuffer),
                                    message.handles,
@@ skipping 28 matching lines @@
     this.errorHandler_ = handler;
   };
 
   Connector.prototype.waitForNextMessageForTesting = function() {
     var wait = core.wait(this.handle_, core.HANDLE_SIGNAL_READABLE);
     this.readMore_(wait.result);
   };
 
   Connector.prototype.readMore_ = function(result) {
     for (;;) {
+      if (this.paused_) {
+        return;
+      }
+
       var read = core.readMessage(this.handle_,
                                   core.READ_MESSAGE_FLAG_NONE);
       if (this.handle_ == null) // The connector has been closed.
         return;
       if (read.result == core.RESULT_SHOULD_WAIT)
         return;
       if (read.result != core.RESULT_OK) {
         // TODO(wangjimmy): Add a handleError method to swap the handle to be
         // closed with a dummy handle in the case when
         // read.result != MOJO_RESULT_FAILED_PRECONDITION
         this.error_ = true;
         if (this.errorHandler_)
           this.errorHandler_.onError();
         return;
       }
       var messageBuffer = new buffer.Buffer(read.buffer);
       var message = new codec.Message(messageBuffer, read.handles);
       if (this.incomingReceiver_)
         this.incomingReceiver_.accept(message);
     }
   };
 
   var exports = {};
   exports.Connector = Connector;
   return exports;
 });